Experience is real Knowledge
'During his school days, Naren and his friends would climb a tree and play swinging on its branches. One day, an elderly person who heard these boys shout, came there and admonished them. To dissuade them from climbing the tree, he told them that it was a 'forbidden tree' with a ghost wandering about it. All boys except Naren were frightened and got off the tree.
Naren was not only a dare-devil but also a skeptic of things people called 'forbidden'. He kept playing and told his friends “if there was a ghost, would it not have eaten us by now?”
Many years later, as Swami Vivekananda, he would tell large audiences "Do not believe a thing because you read it in a book! Do not believe a thing because another had said it so! Find out the truth for yourself! That is realization!" '